Lumbar degenerative disc disease refers to the symptoms of lower back pain and/or radiating pain, numbness or weakness in the legs stemming from a degenerated spinal disc. Cervical Degenerative Disc Disease Video. Neck pain and stiffness may be the result of cervical degenerative disc disease.umbar degenerative disc disease refers to the symptoms of lower back pain and/or radiating pain, numbness or weakness in the legs stemming from a degenerated spinal disc. Cervical Degenerative Disc Disease Video. Neck pain and stiffness may be the result of cervical degenerative disc disease.
Nearly every cell in a personâs body has the same DNA. Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA or mtDNA). The information in DNA is stored as a code made up of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T).
DNA is made of chemical building blocks called nucleotides. These building blocks are made of three parts: a phosphate group, a sugar group and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating. The four types of nitrogen bases found in nucleotides are: adenine (A), thymine (T), guanine (G) and cytosine (C). The order, or sequence, of these bases determines what biological instructions are contained in a strand of DNA.